Knowing what is healthy and being able to afford it are--to me--the two most important issues. I have another thing to add, though; with regards to motivation, being able to cook the healthy food quickly is very important. I know this from experience. Since quitting my unhealthy medicine in December, I've lost almost 30lb, most of it in the last few months. My doctors are happy about it, but it's not as it seems! I have a problem where I put off eating even when I'm hungry because "I don't feel like it" or "I'm busy" or "there's no time to cook anything," and I end up eating nothing until my sensory problems become awful. If I were able to cook healthy food quickly, I'd be able to eat healthy food and be strong instead of just less heavy.
My mom has the other problem; she sometimes gets too hungry to wait to cook, and she'll end up eating something processed. I can see how this could happen to a lot of people when so many of the healthy meals take so much work to prepare. For a while, my mom had the family on the "Ten Years Younger" diet, and I felt great! The reason she stopped was because the meals took so much more work than everyone was used to, especially with me starting college and her starting her first full-time job since the baby was born.
I have a solution for myself; I make a quick smoothie with fruits and ground flaxseed. It won't be so easy when school starts back, though. My friends are aware of my "problems." I think busy Pagans (and others, for that matter) should all know quick, affordable recipes that are super healthy, so they don't have to resort to getting fast food or eating snacks for dinner.